Specific Aim 1: To quantify joint kinematics during treadmill locomotion on the ISS, and to compare those to treadmill locomotion on Earth. The goal of this aim is to measure joint kinematics during treadmill exercise using motion capture data collection. Exercise prescriptions have been developed under the assumption that walking and running in microgravity have the same training effects as during normal gravity. However, if locomotion kinematics differ between microgravity and normal gravity, it is reasonable to hypothesize that training effects may also differ. Furthermore, treadmill locomotion in microgravity occurs on a vibration isolation and stabilization (VIS) treadmill, which may increase the potential for training differences. Similarities and differences in joint kinematics during treadmill locomotion between normal gravity and microgravity on the ISS will be quantified.
Specific Aim 2: To develop a computer model that will assess locomotion speed and external loading condition influences upon joint torque. The overall goal of the advanced exercise prescription being provided to the crewmembers is to increase loading at the joints in order to provide a greater stimulus for bone and muscle health. The computer modeling approach requires inputs of anthropometric measurements, motion kinematics, and external forces applied to the body. External forces applied to the body will be measured with instrumentation built into the treadmill. A subject-specific computer model will be developed and will provide joint kinetic approximations. These approximations will be used to assess the effectiveness of the exercise prescription and will allow for an iterative approach in exercise prescription modification based on evidence. Furthermore, these data will provide better understanding of how exercise speed and external load affects the forces experienced by the joints and muscles. Providing subject loading information for exercise prescriptions will increase the effectiveness of exercise prescription.
Each in flight data collection session included videotaping of nominal exercise sessions on the T2. Tapemarkers, placed at various locations on the body, allowed a detailed biomechanical analysis of locomotion. In flight data collection began at approximately flight day 15 (after the crewmember had an opportunity to acclimate to the ISS and had settled into a normal exercise routine) and at 30-day intervals thereafter to monitor progress and assess exercise effectiveness throughout the crewmember’s mission. A total of six sessions per subject was planned. Video and T2 data including speed, HR, load cell, and accelerometer measures, were downlinked after each session.
Upon completion of this study, investigators expect to be able to determine the most beneficial treadmill exercise conditions that can be used to maintain or improve crewmember health during long-duration space flight.
|Mission||Launch/Start Date||Landing/End Date||Duration|
|Expedition 27||03/14/2011||05/23/2011||70 days|
|Expedition 28||05/23/2011||09/15/2011||115 days|
|Expedition 29||09/16/2011||11/21/2011||40 days|
|Expedition 30||11/14/2011||04/27/2012||166 days|
|Expedition 31||04/27/2012||07/01/2012||65 days|
|Expedition 32||07/01/2012||09/16/2012||78 days|